The equilibrium of dissociated dislocations is discussed in terms of intrinsic material properties such as the ideal stacking fault energy (ideal SFE) and the stacking fault (SF) strain. The ideal SFE is de® ned as the energy per unit area of an in® nitely extendedSF in an ideal in® nite crystal. The e€ ective SFE is de® ned as the energy per unit area of a terminated SF. The terminated SF is a...

HfN specimens deformed via four-point bend tests at room temperature and at 2300 °C (~0.7 Tm) showed increased plasticity response with temperature. Dynamic diffraction via transmission electron microscopy (TEM) revealed ⟨110⟩{111} as the primary slip system in both temperature regimes and ⟨110⟩{110} to be a secondary slip system activated at elevated temperature. Dislocation line lengths chang...

LiNbO3 is a ferroelectric material with a rhombohedral R3c structure at room temperature. A LiNbO3 bicrystal with a f1210g=h1010i 1 low-angle tilt grain boundary was successfully fabricated by diffusion bonding. The resultant boundary was then investigated using highresolution TEM. The boundary composed a periodic array of dislocations with b 1⁄4 1=3h1210i. They dissociated into two partial dis...

The dissociation of dislocations in the NaCl structure is discussed in terms of Fontaine's model. There are no well-defined partials in the dissociation of the Burgers vector a/2 [I101 on the (1x0) slip plane. The stacking fault on this plane is connected with a dilatation normal to (170). This leads to an unique effect of hydrostatic pressure on the frequency of cross slip. Cross slip in stage...

Nanocrystalline nc materials are known to deform via mechanisms not accessible to their coarse-grained counterparts. For example, deformation twins and partial dislocations emitted from grain boundaries have been observed in nc Al and Cu synthesized by severe plastic deformation SPD . This paper further develops an earlier dislocation-based model on the nucleation of deformation twins in nc fac...

This letter presents a study of the atomic mechanism of the initiation of motion of a static twin plane under applied mechanical load in a model shape-memory material. By tracking the deformation under load and using linear stability analysis, we find that the eigenvalues of the Hessian matrix provide an indicator of the initiation of motion of the twin plane. The initiation of motion is signal...

Films of (10 10) textured CoCrPt have been sputtered on polymer substrates for use as thin film tape media. Underlayers of NiAl combined with various intermediate layers were employed to obtain this orientation without thermal damage to the polymer. It was found that NiAl underlayers sputtered on tape substrates have a (112) growth texture, like they do on glass. Film coercivity varied as a fun...